The Idea link is broken... otherwise I would vote YES for this feature too. Would love to be able to share MP4s. Would be even cooler if clients could watch videos without having to download them first.

Considering how essential the mp4 format is in most workflows, I'd say this is something that should be urgently addressed. I can use Dropbox, but would prefer to consolidate work into the Creative Cloud. We all need CC up to full functionality as soon as possible, and this one is important.